1. School of Optics and Photonics, Beijing Institute of Technology, China
2. School of Optics and Photonics, Beijing Institute of Technology, Beijing, China
3. Department of Gastroenterology, The First Medical Center, Chinese PLA General Hospital, China
4. School of Computer Science and Technology, Beijing Institute of Technology, China
5. Department of Gastroenterology, The First Medical Center, Chinese PLA General Hospital, Beijing, China